http://www12.statcan.gc.ca/nhs-enm/2011/ref/dict/households-menage029-eng.cfm
The NOS derives the number of bedrooms a household requires as follows:
A maximum of two persons per bedroom.
Household members, of any age, living as part of a married or common-law couple share a bedroom with their spouse or common-law partner.
Lone-parents, of any age, have a separate bedroom.
Household members aged 18 or over have a separate bedroom, except those living as part of a married or common-law couple.
Household members under 18 years of age of the same sex share a bedroom, except lone-parents and those living as part of a married or common-law couple.
Household members under 5 years of age of the opposite sex share a bedroom if doing so would reduce the number of required bedrooms. This situation would arise only in households with an odd number of males under 18, an odd number of females under 18, and at least one female and one male under the age of 5.
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http://www.cbc.ca/news/canada/british-columbia/national-occupancy-standards-housing-canada-bc-co-op-vancouver-couple-denied-girl-baby-1.4295849